Duet 2 Maestro StealthChop default

bass4aj

In the docs, it says:

Snn Set chopper mode: 0 = constant off time, 1 = random off time, 2 = spread cycle, 3 - stealth chop. the Duet 2 Wifi/Ethernet supports modes 0, 1 and 2. The Duet 2 Maestro supports modes 2 and 3. If this parameter is not provided, the default will be used.

but it does not clarify what "default" is. Is default spread cycle or stealth chop?

dc42

The default in recent firmwares is stealthchop. I have found that spread cycle works better at high speeds. You can send M569 Pnn to find the current mode of driver number nn.

antlestxp

Does the maestro 2 support hybrid function of the tmc drivers. The ability to use stealthchop 2 below a specified travel speed and spread cycle above that? For example my current printer is set to use stealthchop up to 60 and spread cycle anything above to prevent skipped steps printing at high speed.

dc42

The firmware doesn't support that mode currently, but we could add it.

bass4aj

That would be really great, since stealthchop loses effectiveness at high speeds, and it would be nice to regain that torque.

streamliner

@bass4aj I think one of the things @dc42 is indicating here is that when currents are properly tuned, spreadcycle results in better overall prints. Also, when the appropriate current is supplied the noise level is GREATLY reduced as to what testing we've done thus far.

We should look into dialing in our settings correctly for spreadcycle on the maestro.

~DavidH

streamliner

@antlestxp Would you mind sharing your config and describe the kinematics/overall nature of your printer? I would love to create suitable Spreadcycle settings for the Crane/Promega printer lines.

Thanks!

DavidH

dc42

@bass4aj said in Duet 2 Maestro StealthChop default:

That would be really great, since stealthchop loses effectiveness at high speeds, and it would be nice to regain that torque.

This is now on the work list for firmware 2.02.

dc42

@bass4aj, do you know what value the TPWMTHRS register of the stepper driver is set to in your other system?

wilriker

@dc42 said in Duet 2 Maestro StealthChop default:

The default in recent firmwares is stealthchop.

I just updated documentation of M350 to resemble this.

dc42

@wilriker said in Duet 2 Maestro StealthChop default:

@dc42 said in Duet 2 Maestro StealthChop default:

The default in recent firmwares is stealthchop.

I just updated documentation of M350 to resemble this.

I just edited the documentation again, because there is no S parameter on the M350 command. The driver mode is set using the D parameter in the M569 command. I have updated the documentation of M569 to specify the default modes.

bass4aj

@dc42 not sure. I can check when I get home.

antlestxp

@streamliner what specifically would you like to know. I am currently using a 300x300x300 Hypercube Evo CoreXY. It is running marlin on a mks gen board with tmc2130 drivers. I have a D2M on the way that will replace MKS. Most of my printing is done at or under 60mms so my printer spends most of its time silent. However when printing some PLA's or PETG I use a high travel speed to reduce stringing. If the printer is locked into stealthchop it will at some point loose position during a travel move. It would be nice to see something like the hybrid drive available on the DUET but for the quality, features, and support of the DUET, it's worth not living with the hybrid drive.

antlestxp

lol looks like I am late to the game. just saw the hybrid system added in the latest RC! Great work guys!